chr krystle campbell and lingzi lu, martin richard and of course officer collier. you had a moment of silence for them here in boston and throughout the country. >> the mayor will receive an american flag that flew over the finish line at the boston marathon exactly one week ago. the fbi will present the mayor with this commemorative american flag that has flown at half-staff over the boston marathon finish line in a ceremony that we are about to see live here on cnn. and then we are told the city will commence what's being described as a five-phase plan for reopening this street to business, to commerce, to traffic, to passengers, to people just walking along. the first phase will be decontamination and testing, to make sure everything is safe and secure. second phase is structural building assessments, utility coordination, making sure power has been restored. third phase, debris removal, getting rid of all the junk that's accumulated on the streets. phase four, internal building assessments, making sure the buildings are structurally sound. phase five, reentry c